| 1130 | DCRC1 pB was not responding to QET bias after swapping cables from DCRC4. I checked the electrical connection and saw that the short to chassis has returned. This suggest that shorts to chassis cause the DCRC to not tirgger changes in QET bias values. |
| | Starting full warmup |
| 1317 | Close V6 to stop circulation (Put 0% in the V6 tab in the IGHFrontPanel Vi and wait). |
| 1321 | V6 is now fully closed (light is off on IGH, Still pressure (P1) is rising (currently 1.1 mbar), Condenser pressure (G1) falling). Turn off 3He pump (Click Settings in the IGHFrontPanel.Vi and uncheck 3He Pump tab and press Ok) |
| 1327 | Close 1K Pot needle valve |
| 1330 | Open V3 to let mixture from Condenser side into Still side. |
| 1333 | MC(H35) = 0.377 K |
| | DAQ programs are OFF and DCRCs 1,2 & 3 unplugged |
| 1335 | Turn on Still and MC heaters to 20 mW each (Go to Settings in IGHFrontPanel.Vi, Select On in P(Still) and type 20 for Still and 20000 for M/C, Click Ok) |
| 1342 | MC(H35)/1KPot = 2.01/1.407 K |
| 1355 | Close 1K Pot speedivalve, V4a, 4He pump inlet valve. Turn off 4He pump. Close recovery valve to 4He pump outlet. NOTE: remember to open recovery valve when the pump is turned back on. |
| 1417 | MC(H35)/1KPot = 3.42/3.61 K |
| 1417 | G1(fridge) = 462 mbar. Open V9 to release mixture into dump to keep it from going over 1000 mbar (Zach said if we wait till 800+, the warmup might have been faster) |
| 1429 | MC(H35)/1KPot = 3.14/3.76 K. |
| 1437 | Currently, Turbo on the IVC reads 40 nbar. We kept the Turbo on IVC during this run. |
| | Pump out IVC with the turbo pump (step skipped) |
| 1506 | MC temp started to go up faster again |
| 1516 | We will pump the mixture back to dump. After MC hit 10K, will stop the MC and Still heaters and then introduce exchange gas |
| | Pump mixture to dump |
| 1518 | Turn on 3He pump, open V6 to 13%, close V13A. |
| 1521 | G1 is low (16 mbar). Open V6 to 20% then 30% then 100% |
| 1521 | MC temp cools a little bit and then go up again |
| 1526 | Switch MC thermometer from H35 to Cernox (12004) |
| 1529 | P1 = 0.19 mbar. Close V1, condenser speedivalve, and still gate valve so that we are only pumping on the cold trap. |
| 1535 | Rox 1.518 kohm @ 6.02 K(Cernox) |
| 1536 | P1 = 0.035 mbar. Stop pumping on the cold trap and resume pumping on the fridge. Close V12A+speedivalve and open V1, condenser speedivalve, and still gate valve. |
| 1550 | P1 = 0.007 mbar. Stop pumping mixture to dump. Close condenser speedivalve, still gate valve, V1, V3, then V6. |
| 1555 | V6 is fully closed. Close V9, leaving 717.9 mbar in the dump. Turn off 3He pump. |
| 1558 | MC(Cernox) = 6.78. MB= -0.9% |
| 1629 | IVC(turbo valved out) = 3.4e-4 mbar. Close IVC valves to prepare bellow to connect to CVJ. It seems I cannot keep the IVC valve closed to connect the CVJ as the temperature is not rising. So i resume pumping the IVC with the turbo. We will connect the line to CVJ at the time of introducing exchange gas |
| 1805 | MC(Cernox) = 12.26 K. Turn off MC and Still heaters |